When I leaflet I put one through all houses in a road, or knock.
They may have a windy but their Mum or someone might not and they will pass on your leaflet.
Some of my best has come through people passing on my number/leaflet to other people they know.
And if you knock they can see you are polite and not a ratbag so their recommendation will be even stronger.
I had one say 'he seems like a nice young man' (I'm 40!)
Young compared to her I suppose, bless her.